Trump fixated on crowd sizes in Green Bay speech as Democrats draw bigger numbers
President Donald Trump at a 'Make America Great Again' rally in Green Bay, Wisconsin (screengrab)

President Donald Trump fixated on crowd sizes during a "Make America Great Again" re-election campaign rally in Green Bay, Wisconsin.

Trump mentioned former Vice President Joe Biden, Sen. Bernie Sanders (I-VT) and Sen. Elizabeth Warren (D-MA).

But can you imagine any of these people up here doing what I'm doing? There'd be 200 people show up -- if they were president," Trump argued.

"If they weren't president, nobody would show up, is that right?" Trump asked, to applause.

Trump's rally was held at the 10,000 seat Resch Center.

Sanders reportedly had 13,000 people attend his kickoff in Brooklyn.

Sen. Kamala Harris (D-CA) reportedly had 20,000 people attend her kickoff in Oakland.

Trump, however, claimed he set an attendance record for the Resch Center.

"No, this is the record. We set records everywhere, and it's not me," Trump said.

"This is a movement like we've never seen in the history of our country," he claimed.